I want to extract version number from string.
a string = "Tale: The Secrets 1.6"
b string=" The 34. Mask 1.6.98";
So for a version number is 1.6 and for b is 1.6.98
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2This all sort of depends on your defenition of version number right? 1.6 isn't a standard version number in c#, it'd be like 1.6.0.0. What other kinds of version numbers do you plan to encounter? Does a single digit count as a version number? Will your strings have digits other than version numbers that you need to account for? How about using a regular expression to extract any number followed by a period: (([0-9]+)\.?)+ and pass it to the Version class which can take a string in the constructor?devshorts– devshorts2012-01-21 18:49:41 +00:00Commented Jan 21, 2012 at 18:49
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See stackoverflow.com/a/67308239/670028Randy Burden– Randy Burden2021-04-28 21:39:47 +00:00Commented Apr 28, 2021 at 21:39
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4 Answers
\d+(\.\d+)+
\d+ : one or more digits
\. : one point
(\.\d+)+ : one or more occurences of point-digits
Will find
2.5
3.4.567
3.4.567.001
But will not find
12
3.
.23
If you want to exclude decimal numbers like 2.5 and expect a version number to have at least 3 parts, you can use a quantifier like this
\d+(\.\d+){2,}
After the comma, you can specify a maximum number of ocurrences.
answered Jan 21, 2012 at 18:52
Olivier Jacot-Descombes
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Try:
Regex pattern = new Regex("\d+(\.\d+)+");
Match m = pattern.Match(a);
string version = m.Value;
1 Comment
Douglas
That regex would also match dot-terminated numbers, such as
34..You can write
[0-9]+(\.[0-9]+)+$
This should match the format. The $ is for matching at the end, can be dropped if not needed.
1 Comment
Wiktor Stribiżew
If the version number parts are separated with
_, \. should be replaced with _: [0-9]+(_[0-9]+)+$ (referring to this duplicate).By version number, do you mean any sequence of digits interspersed with dots?
\d+(\.\d+)+
